When can I plant Penstemon in Zone 8b

One of the first steps we take when we are determining our gardening schedule is find our USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

You can figure out when you can plant penstemon in Zone 8b by reviewing the USDA zone info.


Planting Calendar for Penstemon

Frost tolerance for penstemon: Tolerant of some frost.
When you should plant them: Up to 5 weeks before last frost.

Penstemon are one of those plants that can tolerate a little bit of cold weather which tells us that you can start planting them earlier than other frost tender plants.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant penstemon
Possibly ok, but a risky time to plant penstemon
Probably not a good time to plant penstemon

The earliest that you can plant penstemon in Zone 8b is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant penstemon and expect a good harvest is probably September. You probably don't want to wait any later than that or else your penstemon may not have a chance to really do well. If you are starting your penstemon indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Zone 8b the average date of last frost happens on March 15. In the coldest months of winter we should expect an average low temperature of 15°F.

Since the USDA zone info for Zone 8b is just an average our actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 8b last frost occurs after March 15 be ready to cover your penstemon if we have one of those late frosts.

USDA Zone Info for Zone 8b

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)March 15
Average Date of First Frost (fall)November 15
Lowest Expected Low15°F
Highest Expected Low20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Zone 8b

You may be interested in our other planting guides for Zone 8b.